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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99a658f3b8a21b5c79737c8b7344565a2d9ec93aebd2d00c235599a727a7af6' 
  AND token = 'Ht+37Lf8mTyuwTXkHIduAtYcST/78uTdd3RNHN7NQR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}